A study in New Delhi looked at how using compost and poultry manure affects soil carbon levels in rice-wheat crop rotation. Adding compost or poultry manure along with half the usual chemical fertilizers increased soil organic carbon significantly after two crop cycles. The soil with compost and chemical fertilizers had the best harvest index and highest non-labile carbon fractions, leading to a 33.24% increase in grain yield. Using compost and chemical fertilizers together at half the recommended dose is a good way to store carbon in the soil and improve crop productivity in rice-wheat rotation.